The spelling of the word "bolender" can be explained with the help of IPA phonetic transcription. The initial sound of the word is 'b', which is pronounced as /b/. The next sound is 'o', which is pronounced as /əʊ/. The following sound is 'l', pronounced as /l/. The next two sounds are 'e' and 'n', which are pronounced as /ɛ/ and /n/ respectively. Finally, the last two sounds are 'd' and 'er', pronounced as /d/ and /ə(r)/ respectively. Therefore, the IPA transcription of this word is /bəʊlɛndə(r)/.